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Are all .usf must be in Engine\Shaders folder?

Are all .usf must be in Engine\Shaders folder?

Can they be put in a GameProject’s Subfolder?

OK. I found a solution.
Fredrik Lindh made a HLSL demo that includs a ShaderCopyHelper plugins.
It will auto copy all .usf in “Shaders” of GameProject directory to Engine\Shaders directory when the Plugin Start.

https://wiki.unrealengine.com/HLSL_Shaders

https://wiki.unrealengine.com/HLSL_Shaders

But I don’t think it is convenient.